单项选择题

From Paragraph 5 the author emphasizes ______.

A．the danger of viruses
B．the common existence of virus particles
C．the short life span of viruses
D．the difficulty in killing viruses
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单项选择题
What is the main idea of this passage
A．We don't need to worry too much about bacteria everywhere in our life.
B．Antibacterial products for the home are found to be effective.
C．The TV advertisement the writer mentioned is a total failure.
D, The existent bacteria pose a threat only to the very young and very ol
单项选择题
According to the author, one will become obsessive-compulsive ______.
A．if he washes his hands every time he touches a surface
B．if he only washes his hands with soap and water
C．if he could not win over the bacteria in his home
D．if he does not fight against the bacteria at home
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